E1M3: Main-Frame (CH Retro Episode)

E1M3: Main-Frame is the third map of CH Retro Episode. It was designed by Christian Hansen.

Other points of interest

 * There is a secret passage in the outside area behind Secret #3, with the switch to unlock Secret #4. This passage will lead you to the red key, required to press the switch in Secret #1 that will lead you to the secret exit.

Secrets

 * 1) Picking up the yellow key will open monster closets in the room below. Enter the north closet and press on the wall with a pool of blood in front of it. You will find a chainsaw, a rocket, armor bonuses, health bonuses, an ammo clip, and a lift leading down. You can also take the lift down, open the door to the east, and quickly go further to get the soul sphere before the lift with it rises. A red key switch is also across the lift, which will open the way to the secret exit. (sector 93)
 * 2) Head to the east side of the central computer room. Doing this will lower a ledge that had imps and partial invisibility in the nukage area. (sector 104)
 * 3) Open the back wall on the ledge where Secret #2 is. Descend the steps and pick up the chaingun in the middle for the secret. (sector 154)
 * 4) Take the steps south of Secret #3 and open the door to the south. Follow the ledge all the way to a switch. After pressing it, return to the room that had the yellow key switch and you can collect a backpack. (sector 191)
 * 5) Leave the room with the yellow key switch. As you descend the steps, a lift lowers. Quickly run northwest into the computer room and to the north side of the central structure. Head inside to pick up a rocket launcher. (sector 125)
 * 6) The secret exit room counts as a secret. (sector 220)

Current records
The records for the map at the Doom Speed Demo Archive are:

The data was last verified in its entirety on December 8, 2021.

Player spawns
This level contains ten spawn points:
 * 1) facing north. (thing 281)
 * 2) facing north. (thing 282)
 * 3) facing south. (thing 283)
 * 4) facing north-west. (thing 284)
 * 5) facing north. (thing 285)
 * 6) facing south-east. (thing 286)
 * 7) facing north. (thing 287)
 * 8) facing south-east. (thing 288)
 * 9) facing north-east. (thing 289)
 * 10) facing south. (thing 290)

Things
This level contains the following numbers of things per skill level: